/*
This file is part of TALER
Copyright (C) 2014-2019 Taler Systems SA
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU Affero General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
TALER is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License along with
TALER; see the file COPYING. If not, see
*/
/**
* @file taler-exchange-httpd_link.c
* @brief Handle /coins/$COIN_PUB/link requests
* @author Florian Dold
* @author Benedikt Mueller
* @author Christian Grothoff
*/
#include "platform.h"
#include
#include
#include
#include "taler_mhd_lib.h"
#include "taler-exchange-httpd_mhd.h"
#include "taler-exchange-httpd_link.h"
#include "taler-exchange-httpd_responses.h"
#include "taler-exchange-httpd_keystate.h"
/**
* Closure for #handle_link_data().
*/
struct HTD_Context
{
/**
* Public key of the coin for which we are running link.
*/
struct TALER_CoinSpendPublicKeyP coin_pub;
/**
* Json array with transfer data we collect.
*/
json_t *mlist;
/**
* Taler error code.
*/
enum TALER_ErrorCode ec;
};
/**
* Function called with the session hashes and transfer secret
* information for a given coin. Gets the linkage data and
* builds the reply for the client.
*
* @param cls closure, a `struct HTD_Context`
* @param transfer_pub public transfer key for the session
* @param ldl link data related to @a transfer_pub
*/
static void
handle_link_data (void *cls,
const struct TALER_TransferPublicKeyP *transfer_pub,
const struct TALER_EXCHANGEDB_LinkList *ldl)
{
struct HTD_Context *ctx = cls;
json_t *list;
if (NULL == ctx->mlist)
return; /* we failed earlier */
if (NULL == (list = json_array ()))
goto fail;
for (const struct TALER_EXCHANGEDB_LinkList *pos = ldl;
NULL != pos;
pos = pos->next)
{
json_t *obj;
obj = json_pack ("{s:o, s:o, s:o}",
"denom_pub",
GNUNET_JSON_from_rsa_public_key
(pos->denom_pub.rsa_public_key),
"ev_sig",
GNUNET_JSON_from_rsa_signature
(pos->ev_sig.rsa_signature),
"link_sig",
GNUNET_JSON_from_data_auto (&pos->orig_coin_link_sig));
if ( (NULL == obj) ||
(0 !=
json_array_append_new (list,
obj)) )
{
json_decref (list);
goto fail;
}
}
{
json_t *root;
root = json_pack ("{s:o, s:o}",
"new_coins",
list,
"transfer_pub",
GNUNET_JSON_from_data_auto (transfer_pub));
if ( (NULL == root) ||
(0 !=
json_array_append_new (ctx->mlist,
root)) )
goto fail;
}
return;
fail:
ctx->ec = TALER_EC_JSON_ALLOCATION_FAILURE;
json_decref (ctx->mlist);
ctx->mlist = NULL;
}
/**
* Execute a link operation. Returns the linkage information that will allow
* the owner of a coin to follow the trail to the refreshed coin.
*
* If it returns a non-error code, the transaction logic MUST NOT queue a MHD
* response. IF it returns an hard error, the transaction logic MUST queue a
* MHD response and set @a mhd_ret. IF it returns the soft error code, the
* function MAY be called again to retry and MUST not queue a MHD response.
*
* @param cls closure
* @param connection MHD request which triggered the transaction
* @param session database session to use
* @param[out] mhd_ret set to MHD response status for @a connection,
* if transaction failed (!)
* @return transaction status
*/
static enum GNUNET_DB_QueryStatus
link_transaction (void *cls,
struct MHD_Connection *connection,
struct TALER_EXCHANGEDB_Session *session,
MHD_RESULT *mhd_ret)
{
struct HTD_Context *ctx = cls;
enum GNUNET_DB_QueryStatus qs;
qs = TEH_plugin->get_link_data (TEH_plugin->cls,
session,
&ctx->coin_pub,
&handle_link_data,
ctx);
if (NULL == ctx->mlist)
{
*mhd_ret = TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
ctx->ec,
"coin_pub");
return GNUNET_DB_STATUS_HARD_ERROR;
}
if (GNUNET_DB_STATUS_SUCCESS_NO_RESULTS == qs)
{
*mhd_ret = TALER_MHD_reply_with_error (connection,
MHD_HTTP_NOT_FOUND,
TALER_EC_LINK_COIN_UNKNOWN,
"coin_pub");
return GNUNET_DB_STATUS_HARD_ERROR;
}
return qs;
}
/**
* Handle a "/coins/$COIN_PUB/link" request.
*
* @param rh context of the handler
* @param connection the MHD connection to handle
* @param args array of additional options (length: 2, first is the coin_pub, second must be "link")
* @return MHD result code
*/
MHD_RESULT
TEH_handler_link (const struct TEH_RequestHandler *rh,
struct MHD_Connection *connection,
const char *const args[2])
{
struct HTD_Context ctx;
MHD_RESULT mhd_ret;
(void) rh;
memset (&ctx,
0,
sizeof (ctx));
if (GNUNET_OK !=
GNUNET_STRINGS_string_to_data (args[0],
strlen (args[0]),
&ctx.coin_pub,
sizeof (ctx.coin_pub)))
{
GNUNET_break_op (0);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_COINS_INVALID_COIN_PUB,
"coin public key malformed");
}
ctx.mlist = json_array ();
if (NULL == ctx.mlist)
{
GNUNET_break (0);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_JSON_ALLOCATION_FAILURE,
"json_array() call failed");
}
if (GNUNET_OK !=
TEH_DB_run_transaction (connection,
"run link",
&mhd_ret,
&link_transaction,
&ctx))
{
if (NULL != ctx.mlist)
json_decref (ctx.mlist);
return mhd_ret;
}
mhd_ret = TALER_MHD_reply_json (connection,
ctx.mlist,
MHD_HTTP_OK);
json_decref (ctx.mlist);
return mhd_ret;
}
/* end of taler-exchange-httpd_link.c */